Merge pull request #38 from joker806/invalid_date_format

Fix regex parsing the date header (allowing multiple brackets)

src/Ddeboer/Imap/Message/Headers.php

@@ -29,7 +29,7 @@ public function __construct(\stdClass $headers)
         }
 
         if (isset($this->array['date'])) {
-            $this->array['date'] = preg_replace('/(.*)\(.*\)/', '$1', $this->array['date']);
+            $this->array['date'] = preg_replace('/([^\(]*)\(.*\)/', '$1', $this->array['date']);
             $this->array['date'] = new \DateTime($this->array['date']);
         }